US3844339A - Inflatable hall - Google Patents

Inflatable hall Download PDF

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Publication number
US3844339A
US3844339A US00234503A US23450372A US3844339A US 3844339 A US3844339 A US 3844339A US 00234503 A US00234503 A US 00234503A US 23450372 A US23450372 A US 23450372A US 3844339 A US3844339 A US 3844339A
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United States
Prior art keywords
foils
hall
foil
air
inflatable
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Expired - Lifetime
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US00234503A
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English (en)
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V Kranz
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Individual
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Individual
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Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H15/00Tents or canopies, in general
    • E04H15/20Tents or canopies, in general inflatable, e.g. shaped, strengthened or supported by fluid pressure
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H15/00Tents or canopies, in general
    • E04H15/20Tents or canopies, in general inflatable, e.g. shaped, strengthened or supported by fluid pressure
    • E04H15/22Tents or canopies, in general inflatable, e.g. shaped, strengthened or supported by fluid pressure supported by air pressure inside the tent
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H15/00Tents or canopies, in general
    • E04H15/20Tents or canopies, in general inflatable, e.g. shaped, strengthened or supported by fluid pressure
    • E04H2015/202Tents or canopies, in general inflatable, e.g. shaped, strengthened or supported by fluid pressure with inflatable panels, without inflatable tubular framework
    • E04H2015/203Tents or canopies, in general inflatable, e.g. shaped, strengthened or supported by fluid pressure with inflatable panels, without inflatable tubular framework supported by a non-inflatable structure or framework
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H15/00Tents or canopies, in general
    • E04H15/20Tents or canopies, in general inflatable, e.g. shaped, strengthened or supported by fluid pressure
    • E04H2015/202Tents or canopies, in general inflatable, e.g. shaped, strengthened or supported by fluid pressure with inflatable panels, without inflatable tubular framework
    • E04H2015/204Tents or canopies, in general inflatable, e.g. shaped, strengthened or supported by fluid pressure with inflatable panels, without inflatable tubular framework made from contiguous inflatable tubes
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H15/00Tents or canopies, in general
    • E04H15/20Tents or canopies, in general inflatable, e.g. shaped, strengthened or supported by fluid pressure
    • E04H2015/206Details of inflation devices, e.g. valves, connections to fluid pressure source
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H15/00Tents or canopies, in general
    • E04H15/20Tents or canopies, in general inflatable, e.g. shaped, strengthened or supported by fluid pressure
    • E04H2015/209Structures with a netting or similar for anchorage

Definitions

  • 6 Claims, 6 Drawing Figures INFLATABLE HALL lnflatable halls are known and are utilized, e.g., as covered courts, warehouses and very generally as protective covering against the influences of weather at construction sites, to wit depending upon the type and property of the covering material employed with or without network of ropes which takes on the traction exerted by the inside pressure of the covering and also by the outside wind pressure onto the covering foil.
  • these inflatable halls must be heated in the winter and therefore require a good insulation, so that heating costs will be kept within reasonable limits.
  • the materials used so far for such coverings to wit thin plastic foils or stronger fabric foils, with the latter being made up with regard to their strength such that they can receive the traction forces influencing them without a net having to be provided, leave much to be desired as far as their heat insulation is concerned.
  • foils of greater thickness there is the disadvantage of a greater weight per unit area of the covering, so that the blower inflating the inflatable hall will have to be more powerful.
  • the rise in costs entailed thereby is still augmented by the additional costs in material on account of the thicker covering.
  • the air in the hall will then be excessively heated again in the case of warm weather and intense sunlight, so that such a hall must be provided in addition with a ventilation.
  • a further object is to provide an inflatable hall of the above type wherein the mutual spacing between the two foils can be adjusted in order to influence the insulating effect.
  • Another object is to provide an inflatable hall of the above type having means for ventilating the space between the foils in those cases, in which the two foils are sealed at the ground separately from one another.
  • An additional object is to control the temperature of the air inside the hall and within the air cushion between the two foils.
  • the covering is madeup of two superposed foils, with an air cushion disposed therebetween, which is in communication with the air-filled hall space through the inner foil.
  • Such an air cushion is provided on account of the fact that the foils employed generally are gas-permeable, so that the air that is diffused outwardly through the inner foil at first accumulates in front of the inner surface of the outer foil before being diffused therethrough to the open air.
  • the air space thus resulting between the two foils provides a very good heat insulation of the inside of the hall without causing the inside of the hall to become too greatly heated in the case of warm weather and much sunlight.
  • the mutual spacing between the two foils, by which the insulating effect can be influenced, can be adjusted, according to a further aspect of the invention, by changing the permeability of the foil material to air.
  • This can first of all be done basically in that foils which have a different permeability to air to start with are employed, in which regard a decrease in the spacing can be attained on the one hand by reducing the air permeability of the inside foil relative to the outside foil and, on the other hand, a decrease of the spacing between the foils can be effected by increasing the air permeability of the outside foil relative to the inside foil.
  • the desired change in air permeability can be attained by vent openings which then are arranged in both foils, but in a manner in which they are off set relative to one another, so that the air in the hall must at least partially flow over the surface of the inside foil in order to reach the open air through the opening disposed in the outside foil, which provides for a better ventilation of the space between the foils.
  • another type of ventilation of the space between the foils has proven good, in which the feed pipe of the blower on the pressure side which penetrates both foils is provided with an opening in the region of the space between the foils, so that a portion of the air fed by the blower into the inside of the hall can flow out into the space between the foils before reaching the inside of the hall.
  • the foils are made up of a material which is substantially not permeable to air and, as is usually the case, are welded together of individual strips of material, a certain'air permeability is expected, or, respectively, provided at the welding seams, so that the above indicated effect of the formation of an air cushion between the inner foil and the outer foil is attained.
  • the welding seams of the one foil so as to be off set relative to the other one, so that,
  • the amount of spacing between the two foils can not only be influenced by changing the permeability, but it can also be influenced by employing materials of different elongation and elasticity. If no netting is employed on the outer foil in order to receive the traction forces, then the outer foil must at least consist of a sturdy material, e.g., a coated fabric which receives the forces transmitted from the inside hall pressure. in such a case, the inner foil can likewise consist of such a sturdy material, but it does not necessarily have to; considering that such materials are relatively expensive, less expensive foils of elastic and greatly extensible material are often employed, which can, however, only be utilized together with a network of ropes resting on the outer foil.
  • a sturdy material e.g., a coated fabric which receives the forces transmitted from the inside hall pressure.
  • the inner foil can likewise consist of such a sturdy material, but it does not necessarily have to; considering that such materials are relatively expensive, less expensive foils of elastic and greatly extensible material are often employed, which can, however, only
  • Such network then provides the advantage that it can urge the outer foil onto the outer surface of the inner foil in the surface areas on which the rope strands rest, in which regard the outer foil bulges between the meshes of the network, so that relatively self-contained air spaces are defined between individual meshes which make possible a good head insulation of the hall space.
  • the welding seams can again be arranged off set from one another between the inner and the outer foil, so that in the case of nontightness of said seams it is not possible for the hall air to flow outwardly directly through the superposed foils.
  • FIG. I is a sectional view of an inflatable hall consisting of two foils
  • FIG. 2 is a view similar to that in FIG. 1, but with the two foils being provided with vent openings
  • FIG. 3 is a sectional view of an inflatable hall consisting of two foils, with a network of ropes being provided on the outer foil
  • FIG. 4 is an outside view of the inflatable hall shown in FIG. 3
  • FIG. 5 is an outside view of an inflatable hall consisting of two foils, with the welding seams of the two foils being shown and
  • FIG. 6 is a sectional view similar to that of FIGS. 1 or 2, with the arrangement of a blower being shown which feeds the inside of the hall as well as also the space between the foils with air.
  • the inflatable hall shown in FIG. 1 comprises for heat insulation an outer foil 3 and an inner foil 4, which are arranged at a spacing A from one another.
  • An air cushion is provided between both foils, which is defined by the air diffused from the inside of the inflatable hall to the outside through both foils.
  • a blower (not shown) maintains a positive air pressure in the hall.
  • the two foils consist of one or more porous, to a certain extent air-permeable materials and are anchored in the ground 2.
  • Each foil is provided with a seal l7, 18 at the anchoring locations.
  • the air flowing outwardly through the inner foil accumulates in front of the inner surface of the outer foil before it likewise passes through said foil and thereby causesa lifting of the outer foil from the surface of the inner foil. In this manner an approximately constant spacing A between the two foils is provided upon otherwise constant operating conditions.
  • the air cushion thus formed between both foils pro-' vides for a sufflcient heat insulation leading to a considerable reduction in heating costs when such halls are operated in the cold season, be it as hall for sports, as warehouse or as halls at construction sites.
  • the two foils of the inflatable hall 1, in which no network of ropes is employed on the outer foil in order to receive the traction forces acting on said foil, are either made up of the same or of different materials, the strength of which is so great that no network is required for receiving these forces.
  • Such materials are plastic-coated cloths. If different materials are employed for the two foils, they may differ as regards essential properties, such as elasticity and porosity. In every case the air diffused from the inside to the outside according to the pressure drop lifts the outer foil from the inner foil, so that the said air cushion is defined.
  • the spacing A between both foils in that regard depends, however, upon the type and property of the foil materials employed. This provides the possibility to adjust said spacing within certain limits. For if it is be desired to increase the spacing, this can be attained in that the gas-permeability of the inner foil relative to that of the outer foil is increased. On the other hand, a reduction in spacing between both foils is attained by increasing the air-permeability of the outer foil with respect to the inner foil.
  • vent openings 5, 6 are provided either in the one or in the other foil or in both foils, which openings are adapted to be opened and closed e.g. by means of flaps l5, 16 or slides.
  • Such vent openings should be arranged in the foils in such a manner that the air cannot directly pass through both foils, i.e. they are to be off set relative to one another as shown in FIG. 2, so that the air emerging through the vent opening 5 will at first have to flow in the space between the foils in order to attain a vent opening 6 in the outer foil.
  • This provides for an additional ventilation of the air space between both foils effecting a better cooling of the hall in particular in summer, because it prevents the air from becoming to greatly heated in the space between the foils.
  • the space between the foils can be fed with air, as shown in FIG. 6, with the aid of a separate outlet opening 22, on the pressure line of a blower 20, so that only a portion of the air fed by the blower 2o flows into the inside of the hall through the outlet opening 21.
  • the blower 20 can be equipped with heating and cooling means 27.
  • the inner foil 4 can be relatively gas-tight, since the air required as air cushion is not taken from the inside of the hall.
  • the greatest spacing of these individual bulgings 24 is adjustable in the above indicated manner just as the spacing A, that is by the selection of different foil properties, by providing vent openings, by non-tightness on the ground side between the sealing elements or directly by branching the air from the blower.
  • the three last mentioned possibilities are proffered particularly in a case where the outer foil is not urged into close contact with the surface of the inner foil by the network. However, if this is the case, that is if the outer foil securely rests with its inner side on the outer surface of the inner foil in the region of the rope strands 7 as shown at 23 in FIG. 3, relatively closed, gas-tight bulged chambers 24 result between the individual meshes of the net.
  • the network of ropes employed thus does not only take on the job of receiving traction forces in the cases in which relatively elastic, extensible foil materials are employed for the covering, but it also fullfills a mechanical sealing function in that it can urge the outer foil onto the inner foil, so that the relatively closed bulged chambers 24 as shown in FIG. 3 result.
  • the air passage through the foils can also be attained via the welding seams which hold together the individual webs of material.
  • These welding seams usually are air permeable in a case where they have not been precisely applied during the welding process. They may also be intentionally produced to be untight.
  • FIG. 3 shows the off set arrangement of the welding seams of the outer foil and the inner foil at 25 and 26, from which it follows that also in such cases in which the outer foil is urged against the inner foil in the region of the network of ropes, the air from the hall cannot directly flow through the welding seams of the foils disposed above one another.
  • the outside air blown into the space between the foils via opening 22 e.g. with the aid of a second blower-pressure pipe may be utilized, as may be gathered from FIG. 6, not only for maintaining the spacing that is provided between both foils, but may also be utilized for controlling the spacing, and, furthermore, for tempering the air provided in the space between the foils.
  • the outer foil is made up of a material aiding in heating the air cushion disposed in the space between the foils primarily in the case of much sunlight in summer.
  • the temperatures within the inner space of the hall also rise to intolerable values.
  • the blower 20 as indicated above also includes heating means which can be employed for heating the sucked-in outside air, or, respectively, the circulating air, when the temperatures outside in the winter time require heating of the air in the hall.
  • heating means which can be employed for heating the sucked-in outside air, or, respectively, the circulating air, when the temperatures outside in the winter time require heating of the air in the hall.
  • air from outside is usually blown into the space between the foils, to wit primarily to save costs, since the outside air that is blown in escapes to the outside again after a short period of time through the vent slab provided in the outer covering.
  • An inflatable hall comprising a covering anchored in the ground, blower means maintaining said covering under inside positive air pressure to provide an air filled al p waid s eriaabsirig IQQQ? up o n n outer foil and an inner foil, said foils disposed above one another, a supporting network of ropes extending in crisscross fashion and engaging the outer surface of the outer foil to urge it toward the inner foil and to form a plurality of pockets between the inner and outer foils and means communicating said pockets through said inner foil with said air filled hall space.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Tents Or Canopies (AREA)
  • Central Air Conditioning (AREA)
US00234503A 1971-03-19 1972-03-14 Inflatable hall Expired - Lifetime US3844339A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2113407A DE2113407C3 (de) 1971-03-19 1971-03-19 Traglufthalle
DE2209376A DE2209376A1 (de) 1971-03-19 1972-02-28 Traglufthalle

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US3844339A true US3844339A (en) 1974-10-29

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US00234503A Expired - Lifetime US3844339A (en) 1971-03-19 1972-03-14 Inflatable hall

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Country Link
US (1) US3844339A (xx)
BE (1) BE780837A (xx)
CA (1) CA966753A (xx)
DE (2) DE2113407C3 (xx)
ES (1) ES400904A1 (xx)
FR (1) FR2130416B1 (xx)
GB (1) GB1378435A (xx)
IT (1) IT950315B (xx)
NL (1) NL7203543A (xx)
SE (1) SE371852B (xx)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5044364A (en) * 1989-06-19 1991-09-03 Primed Products, Inc. Method and apparatus for flowing conditioned air onto person
US5516600A (en) * 1994-01-26 1996-05-14 Gnb Battery Technologies Inc. Temperature-sensitive thermal insulators for lead-acid batteries
US5632769A (en) * 1994-01-26 1997-05-27 Mallinckrodt Medical, Inc. Warming blanket for pediatric use
US5640727A (en) * 1995-10-18 1997-06-24 Mallinckrodt Medical, Inc. Contoured inflatable blanket
US5675848A (en) * 1995-10-18 1997-10-14 Mallinckrodt Medical, Inc. Inflatable blanket having perforations of different sizes
US5683441A (en) * 1994-07-25 1997-11-04 Mallinckrodt Medical, Inc. Inflatable blanket having air flow deflector
US5735890A (en) * 1995-10-18 1998-04-07 Mallinckrodt Medical, Inc. Inflatable blanket having access slits
US5749109A (en) * 1995-10-18 1998-05-12 Mallinckrodt Medical, Inc. Inflatable blanket having selective air flow patterns
US5792216A (en) * 1994-06-21 1998-08-11 Mallincrodt Medical, Inc. Methods of preventing hypothermia using an upper body warming blanket
US5890243A (en) * 1994-11-23 1999-04-06 Mallinckrodt, Inc. Inflatable blanket having openings formed therein
EP1065456A1 (en) * 1989-03-01 2001-01-03 Polar Technologies International Pty Limited Snow making method and device
US20120255707A1 (en) * 2010-09-17 2012-10-11 Tianjin University Of Science & Technology Inflatable wall material, cold storage house using the same, and air-conditioned storehouse using the same
EP2570151A1 (en) * 2011-09-16 2013-03-20 Sunless Solutions Limited Inflatable structure
ITAN20120151A1 (it) * 2012-11-15 2014-05-16 Sauro Bianchelli Sistema in grado di produrre energia elettrica
US20150114439A1 (en) * 2013-10-24 2015-04-30 Hot Pod Yoga Limited Inflatable exercise chamber
FR3038120A1 (fr) * 2015-06-26 2016-12-30 Commissariat Energie Atomique Caisse de transport souple et etanche
US20190112830A1 (en) * 2017-10-12 2019-04-18 Air Structures American Technologies, Inc. Air supported structures with frozen precipitation accumulation prevention

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2209495B2 (xx) * 1972-06-21 1976-04-23 Sales Jean Michel
FR2204744B2 (xx) * 1972-10-26 1976-08-20 Raffinage Cie Francaise
JPS55161150A (en) * 1979-06-01 1980-12-15 Tajima Roofing Co Heattinsulating asphalt waterproof board laying method thereof
US4559746A (en) * 1984-08-22 1985-12-24 Owens-Corning Fiberglas Corporation Air-supported fabric roof structure
FR2592273A1 (fr) * 1986-01-02 1987-07-03 Montacq Didier Serre ou abri gonflable
FR2594157B1 (fr) * 1986-02-07 1991-03-15 Sodeteg Radome pliant.
FR3068570B1 (fr) * 2017-07-07 2019-08-16 Andre Barre Serre agricole deplacable comportant une ossature avec arceaux reunis par au moins une entretoise de forme particuliere et une couverture dotee d'un systeme lateral d'aeration simplifie

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3256895A (en) * 1963-10-03 1966-06-21 William L Duquette Tension-restrained air supported structure

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3256895A (en) * 1963-10-03 1966-06-21 William L Duquette Tension-restrained air supported structure

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1065456A1 (en) * 1989-03-01 2001-01-03 Polar Technologies International Pty Limited Snow making method and device
US5044364A (en) * 1989-06-19 1991-09-03 Primed Products, Inc. Method and apparatus for flowing conditioned air onto person
US6156058A (en) * 1994-01-26 2000-12-05 Mallinckrodt Inc. Warming blanket for pediatric use
US5516600A (en) * 1994-01-26 1996-05-14 Gnb Battery Technologies Inc. Temperature-sensitive thermal insulators for lead-acid batteries
US5632769A (en) * 1994-01-26 1997-05-27 Mallinckrodt Medical, Inc. Warming blanket for pediatric use
US5643337A (en) * 1994-01-26 1997-07-01 Mallinckrodt Medical, Inc. Warming blanket for pediatric use
US6013098A (en) * 1994-01-26 2000-01-11 Mallinckrodt Inc. Warming blanket for pediatric use
US5716387A (en) * 1994-01-26 1998-02-10 Mallinckrodt Medical, Inc. Warming blanket for pediatric use
US5792216A (en) * 1994-06-21 1998-08-11 Mallincrodt Medical, Inc. Methods of preventing hypothermia using an upper body warming blanket
US5683441A (en) * 1994-07-25 1997-11-04 Mallinckrodt Medical, Inc. Inflatable blanket having air flow deflector
US5890243A (en) * 1994-11-23 1999-04-06 Mallinckrodt, Inc. Inflatable blanket having openings formed therein
US6112348A (en) * 1994-11-23 2000-09-05 Mallinckrodt Inc. Inflatable blanket having openings formed therein
US5735890A (en) * 1995-10-18 1998-04-07 Mallinckrodt Medical, Inc. Inflatable blanket having access slits
US5749109A (en) * 1995-10-18 1998-05-12 Mallinckrodt Medical, Inc. Inflatable blanket having selective air flow patterns
US5675848A (en) * 1995-10-18 1997-10-14 Mallinckrodt Medical, Inc. Inflatable blanket having perforations of different sizes
US5640727A (en) * 1995-10-18 1997-06-24 Mallinckrodt Medical, Inc. Contoured inflatable blanket
US10047519B2 (en) * 2010-09-17 2018-08-14 Tianjin Gasin-DH Preservation Technologies Co., Ltd. Inflatable wall material, cold storage house using the same, and air-conditioned storehouse using the same
US20120255707A1 (en) * 2010-09-17 2012-10-11 Tianjin University Of Science & Technology Inflatable wall material, cold storage house using the same, and air-conditioned storehouse using the same
EP2570151A1 (en) * 2011-09-16 2013-03-20 Sunless Solutions Limited Inflatable structure
ITAN20120151A1 (it) * 2012-11-15 2014-05-16 Sauro Bianchelli Sistema in grado di produrre energia elettrica
CN105849343A (zh) * 2013-10-24 2016-08-10 霍特波德瑜伽有限公司 可充气运动室
KR20160088875A (ko) * 2013-10-24 2016-07-26 핫 포드 요가 리미티드 가스 투과성 내부 막을 구비하는 가열 방식의 팽창 가능 운동 챔버
JP2016540905A (ja) * 2013-10-24 2016-12-28 ホット パッド ヨガ リミテッド 気体透過性の内膜を備えた被暖房膨張式エクササイズチャンバ
US20150114439A1 (en) * 2013-10-24 2015-04-30 Hot Pod Yoga Limited Inflatable exercise chamber
US9708830B2 (en) * 2013-10-24 2017-07-18 Hot Pod Yoga Limited Heated inflatable exercise chamber with gas-permeable inner membrane
AU2014338757B2 (en) * 2013-10-24 2018-07-05 Hotpod Holdings Ltd Heated inflatable exercise chamber with gas-permeable inner membrane
FR3038120A1 (fr) * 2015-06-26 2016-12-30 Commissariat Energie Atomique Caisse de transport souple et etanche
US20190112830A1 (en) * 2017-10-12 2019-04-18 Air Structures American Technologies, Inc. Air supported structures with frozen precipitation accumulation prevention
US10995513B2 (en) * 2017-10-12 2021-05-04 Air Structures American Technologies, Inc. Air supported structures with frozen precipitation accumulation prevention

Also Published As

Publication number Publication date
FR2130416B1 (xx) 1976-08-06
GB1378435A (en) 1974-12-27
FR2130416A1 (xx) 1972-11-03
SE371852B (xx) 1974-12-02
DE2113407A1 (de) 1972-10-05
IT950315B (it) 1973-06-20
ES400904A1 (es) 1975-01-16
DE2113407B2 (de) 1974-12-05
NL7203543A (xx) 1972-09-21
BE780837A (fr) 1972-07-17
DE2113407C3 (de) 1975-07-24
CA966753A (en) 1975-04-29
DE2209376A1 (de) 1973-09-06

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